CN1104126C - Apparatus and method for processing ATM cells in ATM switching system - Google Patents
Apparatus and method for processing ATM cells in ATM switching system Download PDFInfo
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- 238000012545 processing Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title description 8
- 238000013519 translation Methods 0.000 claims abstract description 43
- 238000004891 communication Methods 0.000 claims abstract description 39
- 238000012546 transfer Methods 0.000 claims abstract description 25
- 239000000872 buffer Substances 0.000 claims description 13
- 230000005540 biological transmission Effects 0.000 claims description 7
- 238000007689 inspection Methods 0.000 claims description 7
- 238000003693 cell processing method Methods 0.000 claims description 4
- 230000006870 function Effects 0.000 abstract description 3
- 101100257981 Arabidopsis thaliana S-ACP-DES3 gene Proteins 0.000 description 3
- 101150093202 SAD3 gene Proteins 0.000 description 3
- 101100325615 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) MEC1 gene Proteins 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004044 response Effects 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/04—Selecting arrangements for multiplex systems for time-division multiplexing
- H04Q11/0428—Integrated services digital network, i.e. systems for transmission of different types of digitised signals, e.g. speech, data, telecentral, television signals
- H04Q11/0478—Provisions for broadband connections
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/564—Connection-oriented
- H04L2012/5642—Multicast/broadcast/point-multipoint, e.g. VOD
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5638—Services, e.g. multimedia, GOS, QOS
- H04L2012/5646—Cell characteristics, e.g. loss, delay, jitter, sequence integrity
- H04L2012/5652—Cell construction, e.g. including header, packetisation, depacketisation, assembly, reassembly
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/54—Store-and-forward switching systems
- H04L12/56—Packet switching systems
- H04L12/5601—Transfer mode dependent, e.g. ATM
- H04L2012/5678—Traffic aspects, e.g. arbitration, load balancing, smoothing, buffer management
- H04L2012/5681—Buffer or queue management
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Abstract
An asynchronous transfer mode (ATM) switching system includes a cell switching assembly having at least one switch port for transferring an ATM cell, and a subscriber board having a plurality of subscriber ports. A cell processing apparatus for use in the ATM switching system includes a look-up memory for storing control information for determining whether to copy an ATM cell from the switch port, and a cell copy controller for copying the ATM cell from the switch port and transferring ATM cells copied to the subscriber ports according to the control information stored in the look-up memory. If the ATM cell is a point-to-point communication cell, the ATM switching system translates the header included in the cell according to control information and transfers the ATM cell having the translated header to at least one of the subscriber ports. However, if the ATM cell is a point-to-point communication cell, the ATM switching system selects the subscriber ports based on the translated header and transfers the cell of which header is separated to the selected subscriber ports. To limit the maximum number of required copying inside a switching terminal to the maximum size of a switch and to eliminate the need of abandoning a cell by performing copying to a required output port inside a subscriber board. A cell copying and header translation control part 210 is provided with the functions of inverse multiplexing to an output port for the cell for point-to-point communication, the copying of the cell for multi-address and header (VPI/VCI) translation. A lookup memory 220 is provided with control information for deciding the propriety of copying to respective subscriber ports and a VPI/VCI translation value for the respective cells relating to the copying of the multi-address cell.
Description
Technical field
The present invention relates to ATM (asynchronous transfer mode) switching system, more precisely, relate to the apparatus and method of the processing ATM cell of the user's plate that is used for atm exchange system.
Background technology
Usually, in the BISDN (B-ISDN Broadband-ISDN) that adopts the ATM communication system, " point-to-multipoint communication " vocabulary shows a kind of like this communication, and it forms the calling that a plurality of output points are arranged for an input source.A kind of like this point-to-multipoint communication is applied to television network and the video conferencing based on CATV (cable TV) usually.Like this, there are how many output points just need duplicate what parts to input source, and the result who duplicates is sent to each output point.
Simultaneously, because the ATM communication system may require to have at each output point the value of different VPI/VCI (virtual path identifier/virtual channel identifier), so that differentiation connection performance, so, the ATM communication system need comprise cell title translation device, and it (is ATM cell that the latter distributes about each data of duplicating; After this be called " cell ") different VPI/VCI.
The utilization of cell title translation device sends to the switched circuit of output port to cell, cell by there being how many output points to duplicate, and according to duplicating identification number and original VPI/VCI determines output port with regard to the form of duplicating what parts.Then, cell title translation device becomes the required VPI/VCI of output port to the cell title translation, and the cell that has the title after the translation is sent to output port.For a kind of like this cell title translation device, the J.Turner of Washington, DC university has proposed the duplicate network system., all be connected under the situation of a switching port less than user's (middling speed and low speed user) of interchanger heap(ed) capacity separately a plurality of, a kind of like this duplicate network system can not provide the point-to-multipoint communication service.
For example, as Fig. 1 explanation, under atm exchange system has situation with the user network of such switching port, promptly, 64E1 level user SAE1 or 3DS3 level user SAD3 are connected to this switching port, and then each cell that duplicates from a signal source should be sent to each output port of same interchanger.In this case, because two or more cell can not send to identical output port at the same time, so, have only selected a transmission in these cells back to, and remaining cell is sent so that cushion.For example, under the situation of 64E1 level user SAE1, have only one in these cells to be transmitted, and remaining 63 cells should be cushioned simultaneously, thereby discarded these remaining cells inevitably.Therefore, must provide based on the routing iinformation of searching that utilizes title separately.So that under the situation that the DS3 level connects one in three cells or under E1 level connection situation a user port that sends to appointment in 64 cells.
Summary of the invention
Therefore, an object of the present invention is to provide a kind of like this apparatus and method, it is used for each ATM cell of duplicating from a signal source is sent to user port and not discarded ATM cell of being duplicated.
Another object of the present invention provides the apparatus and method of handling ATM cell, and wherein, cell only sends in the user port to, even also like this under situation about not providing based on the routing iinformation of searching that utilizes title.
Cell processing unit according to a kind of asynchronous transfer mode switching system of the present invention, described asynchronous transfer mode switching system comprises and is used to user's plate of transmitting cell switching assembly ATM cell, that have a switching port at least and a plurality of user ports being arranged, it is characterized in that, described cell processing unit comprises: search memory, it is used to store control information, so that whether decision duplicates from the next cell of described switching port; Cell duplicates and the title translation controller, and it is used to duplicate from the next cell of described switching port, and according to being stored in the described control information of searching in the memory, the cell after duplicating is sent to described user port; With, a plurality of user's output buffers corresponding to each user port.
Search memory and cell and duplicate control setting on user's plate.The cell copy controller is according to being stored in the control information of searching in the memory, translation cell title, and the cell with the title after the translation is sent to a minimum user port according to control information.During the cell of the title after transmission has translation, the cell copy controller after translation title and remaining payload separately, and title and the payload after the translation be sent to each user port.In addition, the cell processing unit comprises a plurality of user's output buffers corresponding to each user port.When separated title and remaining unit are sent to user port, the cell copy controller produces write signal for each user port, so that corresponding user's output buffer is advanced in the temporary transient storage in remaining unit, thereafter remaining unit is sent to user port.
According to a kind of asynchronous transfer mode switching system of the present invention, it comprises cell switching assembly and user's plate, described cell switching assembly has the switching port that at least one is used to transmit ATM cell, and described user's plate has a plurality of user ports, it is characterized in that, described asynchronous transfer mode switching system comprises: the cell processing unit that forms on described user's plate, be used for duplicating from the cell of described switching port and the cell that duplicates sent at least one port of the described user port that is connected to described user's plate, described cell processing unit comprises: search memory, it is used to store control information, so that whether decision duplicates from the next cell of described switching port; Cell duplicates and the title translation controller, and it is used to duplicate from the next cell of described switching port, and according to being stored in the described control information of searching in the memory, the cell after duplicating is sent to described user port; With, a plurality of user's output buffers corresponding to each user port.
In addition, atm exchange system is checked the position of checking of the title that is included in the cell, so that determine that the cell that comes from switching port is point-to-point communication cell or point-to-multipoint communication cell.
If cell is the point-to-point communication cell, then atm exchange system is just translated the title that is included in the cell according to control information, and the cell of the title after handle and the translation is sent to the minimum port in the user port., if cell is the point-to-multipoint communication cell, atm exchange system is selected user port according to the title after translating, and the cell that its title is separated is sent to selected user port.
Therefore, cell processing method according to a kind of asynchronous transfer mode switching system of the present invention, described asynchronous transfer mode switching system comprise be used to transmit ATM cell, have a cell switching assembly of a switching port and have user's plate of a plurality of user ports at least, it is characterized in that, described cell processing method comprises the steps: to be included in by inspection the inspection position of the title in the cell, to determine that the cell that comes from described switching port is point-to-point communication cell or point-to-multipoint communication cell; If described cell is the point-to-point communication cell, then described cell demultiplex, so that the cell behind the demultiplex is sent to a predetermined port in the described user port, comprise according to control information, translation is included in title in the cell, and the cell with the title after the translation is transferred at least one port in the described user port; If cell is the point-to-multipoint communication cell, duplicate cell, cell after duplicating with transmission at least one mouthful in the described user port comprises that user port is selected in rebellion according to the title after the translation, and the cell that has separated title sent to the selected user port.
Description of drawings
When reading as an example the embodiment of the present invention that describes in detail below in conjunction with accompanying drawing, will know above and other objects of the present invention, feature and advantage, in the accompanying drawing:
Fig. 1 is the block diagram of common asynchronous transfer mode switching system;
Fig. 2 be according to an embodiment of the invention, the block diagram of the cell processing unit that is provided with in Fig. 1 user's plate;
Fig. 3 be according to an embodiment of the invention, Fig. 2 cell duplicates and the more detailed block diagram of title translation control (210);
Fig. 4 a is to utilize cell according to the present invention to duplicate cell with the title translation controller to duplicate sequential chart with the demultiplex operation to 4c; With
Fig. 5 is according to an embodiment of the invention, represents that cell duplicates and the flow chart of demultiplex program.
Embodiment
Below in conjunction with accompanying drawing, describe preferred embodiment of the present invention in detail, in the accompanying drawings, the identical identical or similar element of label representative.In addition, should be expressly understood that such as the such numerous characteristics details of detail circuits element, just as an example so that can understand the present invention better, and the present invention can implement shown in the figure under the situation that does not have these characteristic details.In addition, should point out,, will dispense detailed description wittingly relevant prior art if think not have help to describing notion of the present invention.Some speech that are used for present disclosure are according to due regard to the defining of function of the present invention, and are to replace according to common practice or user or chip designer's wish.Preferably define described each speech according to the described content of entire description.
At first, whether cell processing unit decision cell of the present invention is a kind of multicast (multicasting) cell, and whether decision sends the cell that duplicates to each user port, and comes translated title according to being stored in the control information of searching in the memory.
With reference to figure 2, comprise according to the cell processing unit that is provided with on user's plate of the present invention: cell duplicates and title translation controller 210; Search memory 220; With a plurality of user's output buffers 231 to 234.Cell duplicates to have with title translation controller 210 point-to-point communication cell demultiplex is given each output port, duplicated multicast (being point-to-multipoint communication) cell and translated title functions such as (VPI/VCI).Searching memory 220 is useful on decision and whether duplicates the required control information of title value (VPI/VCI) after the multicast cell is given the translation of each user port and each multicast cell of decision.User's output buffer 231 to 234 is made of FIFO (first in first out) memory, is used to be stored in the cell before user port transmits cell information.In fact, this buffer can be included in and be used for cell is sent to the transmitting element of user port.
With reference to figure 3, cell duplicates with title translation controller 210 and comprises: the counter 217 that is used to produce the sequential control signal; Be used for CPU (central control unit does not draw) is connected to and search memory 220 so that change the logical circuit be stored in the control logic circuit of searching the control information in the memory 220 and be used to receive the multicast cell.In addition, cell duplicates with title translation controller 210 and comprises logical circuit and the shift register 211 that is used for cell information is kept a scheduled time, and above-mentioned logical circuit produces the write signal that is used for the non-multicast of demultiplex (being point-to-point communication) input cell and produces and is used to duplicate the write signal that cell is imported in multicast.
As shown in Figure 3; counter 217 can be made up of radix 61 counting because handle for time of the 5th byte (title guard byte) of time of 4 byte header of the ATM cell of forming by 53 bytes of each port and transmission title and 48 byte payloads and be 61 bytes (i.e. 4 bytes * 4 bytes+49 bytes=61 bytes)., counter 217 is preferably formed (i.e. 61 bytes+1 byte boundary (margin) * 4 port) by radix 65 counters, so that distinguish the time border.
The exercise question of being submitted to by the applicant is at length to disclose in 94/30266 the korean patent application to be connected to the memory accessing controller 216 of searching memory 220 for the application number of " memory access control method of Memory Access Control Method inAsynchronous Transfer Mode Switching System in the asynchronous transfer mode switching system ".Buffer read/write signal generator 215 produces write signal according to priority or side by side and gives each user port according to the count value of counter 217.Shift register 211 response clock signals of being made up of 8 triggers are shifted 8 bit data, and duplicate with title translation controller 210 decision when whether producing title and searching signal and write signal at cell, with this data delay.
Simultaneously, the title of input cell has the position of inspection, is used to determine that cell is point-to-point communication cell or multicast (a bit to multiple spot) cell.Comprise this cell of checking the position in case receive, just as Fig. 5 is said, handle the input cell according to cell processing unit of the present invention.
With reference to figure 5, according to the inspection position that is included in the title, check that the input cell is multicast cell or point-to-point communication cell in step 501.As to look into the input cell be the point-to-point communication cell, and cell duplicates with title translation controller 210 in step 505 just the cell demultiplex, and the cell behind the demultiplex is sent to of correspondence in the user port.
Fig. 4 a explanation is arrived under the situation of port #2 by demultiplex at the point-to-point communication cell, prepares to deliver to the input data of user's output buffer 231-234 and the sequential chart of write signal.At this, the output of the count value of response count device 217, and produce all write signals simultaneously, and no matter be that port, as the dotted line representative.The produced simultaneously reason of write signal is because the title of input cell is to produce at this synchronization.
At the input cell is under the situation of the multicast cell that should duplicate, and cell duplicates with title translation controller 210 and reads output control information position (4) according to the vpi/vci value of cell from searching memory 220 in step 502.In step 503, check whether be provided with control bit, so that determine to duplicate the port of cell according to control bit.If do not put control bit, cell duplicates with title translation controller 210 and just reads the output vpi/vci value of each port in step 504 from searching memory 520, and this vpi/vci value is sent to user's output buffer 231 to 234.Then, according to above-mentioned control bit, cell duplicate with title translation controller 210 in step 507, according to the output of the count value of counter 217, in turn produce each write signal.
Fig. 4 b explanation is being provided with control bit, thereby will duplicate cell under the situation to all ports the sequential chart of input data and write signal.Fig. 4 c explanation is imported the sequential chart of data and write signal under situation about will duplicate cell to port one and port 3.At this, each is turned over the heading message of selecting is made up of 4 bytes, and payload is made up of 49 bytes, as described.
Simultaneously, if the input cell is not the multicast cell in step 501, cell duplicates with title translation controller 210 should import the cell demultiplex in step 505, and after in step 506, producing title, cell duplicates with title translation controller 210 and does not produce write signal, and in 12 byte clock times transmission data, so that regulate the control timing of multicast cell, by this way, cell duplicates with title translation controller 210 and at first reads 4 bytes, after 12 byte clock times postpone, read remaining byte then.In case finish the operation that produces title, just produce 49 byte payloads, and produce write signal to such port in step 507, produce the write signal relevant at described port with described title.
Table 1 and table 2 illustrate respectively and are stored in the control information of searching in the memory 202.Specifically, table 1 explanation is about the control information of the multicast cell corresponding with E1 user's plate SAE1, and table 2 explanation is about the control information of the multicast cell corresponding with DS3 user's plate SAD3.＜table 1 〉
＜table 2 〉
| ADD | MSB | Position 6 | Position 5 | | | Position 2 | | LSB |
| 00-03 | Ignore | |||||||
| 04 | 0 | 0 | 0 | 0 | | Port 2 | Port one | Port 0 |
| 05 | Port 0VPI | ||||
| 06 | Port 0VPI | Port 0VCI | |||
| 07 | Port 0VCI | ||||
| 08 | Port 0VCI | 0 | 0 | 0 | 0 |
| 09 | Port one VPI | ||||
| 0a | Port one VPI | Port 0VCI | |||
| 0b | Port one VCI | ||||
| 0c | Port one VCI | 0 | 0 | 0 | 0 |
| 0d | Port 2VPI | ||||
| 0e | Port 2VPI | Port 2VCI | |||
| 0f | Port 2VCI | ||||
| 10 | Port 2VCI | 0 | 0 | 0 | 0 |
| 11 | Port 3VPI | ||||
| 12 | Port 3VPI | Port 3VCI | |||
| 13 | Port 3VPI | ||||
| 14 | Port 3VCI | 0 | 0 | 0 | 0 |
| 15-1f | Ignore | ||||
| ADD | MSB | Position 6 | Position 5 | | | Position 2 | | LSB | |
| 00 | 0 | 0 | 0 | 0 | 0 | Port 2 | Port one | Port 0 | |
| 01 | Port 0VPI | ||||||||
| 02 | Port 0VPI | Port 0VCI | |||||||
| 03 | Port 0VCI | ||||||||
| 04 | Port 0VCI | 0 | 0 | 0 | 0 | ||||
| 05 | Port one VPI | ||||||||
| 06 | Port one VPI | Port one VCI | |||||||
| 07 | Port one VCI | ||||||||
| 08 | Port one VCI | 0 | 0 | 0 | 0 |
| 09 | Port 2VPI | ||||
| 0a | Port 2VPI | Port 2VCI | |||
| 0b | Port 2VCI | ||||
| 0c | Port 2VCI | 0 | 0 | 0 | 0 |
| 0d-df | Ignore | ||||
The existing atm exchange system that will describe comprising of Fig. 1 of cell processing unit of the present invention.Whether be sent to multiplexer/demultiplexer (D1MA) 121 of E1 level user and 122 cell from cell switching assembly (CSA) 110 is that the multicast cell is sent to all user base areas (SAE1) 131 and 132 or be sent to specific plate according to described cell.At cell is under the situation of point-to-point communication cell, and user's plate (SAE1) 131 and 132 is with described cell demultiplex and be sent to a port in four ports.And be under the situation of multicast cell at cell, just duplicate cell and according to searching the title of translating this cell.By this way, can duplicate the title of multicast cell and translation cell selectively.In addition, even transmit under the situation of cells at multiplexer/demultiplexer (D3MA) 123 from the user of cell switching assembly 110 to DS3 levels, according to mode same as described above, with user's plate SAD3 in three ports demultiplex or duplicate described cell relatively.
As having a taste of from above-mentioned institute, even a plurality of middling speed and low speed user all are connected to a switching port, atm exchange system of the present invention also can provide some communication service to multiple spot.In other words, because atm exchange system of the present invention does not duplicate cell on interchanger, so, can unrestrictedly expand the quantity of middling speed and low speed user.In addition, device of the present invention cell of process points point to-point communication in an identical manner and point-to-multipoint communication cell.Like this, the cell control logic circuit is sequentially controlled by counter, makes that the cell processing time can be constant, thereby causes reducing the cell variation of time of delay.In addition, device of the present invention is not translated the title of point-to-point communication cell.Like this, mainly provide at atm exchange system under the situation of point-to-point communication service, device of the present invention needn't be controlled and search memory, has so just reduced controlled quentity controlled variable.
Though described most preferred embodiment of the present invention above in detail, but should be expressly understood, the professional and technical personnel may propose many variations and modification in the basic inventive concept of this introduction, and these variations and revising will still belong in the spirit and scope of the present invention of determining as appending claims.
Claims (9)
1. an asynchronous transfer mode (ATM) switching system, it comprises cell switching assembly and user's plate, described cell switching assembly has the switching port that at least one is used to transmit ATM cell, and described user's plate has a plurality of user ports, it is characterized in that described asynchronous transfer mode switching system comprises:
The cell processing unit that forms on described user's plate is used for duplicating from the cell of described switching port with the cell that duplicates and sends at least one port of the described user port that is connected to described user's plate to, and described cell processing unit comprises:
Search memory, it is used to store control information, so that whether decision duplicates from the next cell of described switching port;
Cell duplicates and the title translation controller, and it is used to duplicate from the next cell of described switching port, and according to being stored in the described control information of searching in the memory, the cell after duplicating is sent to described user port; With
A plurality of user's output buffers corresponding to each user port.
2. asynchronous transfer mode switching system according to claim 1, it is characterized in that, at the cell that comes from described switching port is under the situation of point-to-point communication cell, the cell demultiplex that described cell processing unit operationally will come from described switching port, and the cell behind the demultiplex is sent to a port of the correspondence in the described user port; In asynchronous translative mode switching system, at the cell that comes from described switching port is under the situation of point-to-multipoint communication cell, described cell processing unit operationally duplicates from the next cell of described switching port, and the cell after will duplicating sends corresponding user port to.
3. asynchronous transfer mode switching system according to claim 2, it is characterized in that, the described cell that comes from switching port includes the title of checking the position, and it is point-to-point communication cell or point-to-multipoint communication cell that the cell processing unit operationally utilizes the described cell of described inspection position decision.
4. the cell processing unit of an asynchronous transfer mode switching system, described asynchronous transfer mode switching system comprises and is used to user's plate of transmitting cell switching assembly ATM cell, that have a switching port at least and a plurality of user ports being arranged, it is characterized in that described cell processing unit comprises:
Search memory, it is used to store control information, so that whether decision duplicates from the next cell of described switching port;
Cell duplicates and the title translation controller, and it is used to duplicate from the next cell of described switching port, and according to being stored in the described control information of searching in the memory, the cell after duplicating is sent to described user port; With
A plurality of user's output buffers corresponding to each user port.
5. the cell processing unit of asynchronous transfer mode switching system according to claim 4 is characterized in that, does not put described memory and the described cell copy controller searched on described user's plate.
6. the cell processing unit of asynchronous transfer mode switching system according to claim 5, it is characterized in that, described cell copy controller is operationally according to being stored in the control signal of searching in the memory, translate the title of described cell, and be sent at least one port in the described user port according to the cell that described control information will have a title after the translation.
7. the cell processing unit of asynchronous transfer mode switching system according to claim 6, it is characterized in that, during the cell of the title after transmission has translation, title after described cell copy controller operationally will be translated and remaining payload separately, and the title after will translating and payload are sent to user port separately.
8. the cell processing unit of asynchronous transfer mode switching system according to claim 6, it is characterized in that, when transmitting title separately and remaining cell to user port, described cell copy controller operationally produces write signal for each user port, so that temporarily remaining cell is stored into corresponding user's output buffer, and, after this remaining cell is sent to user port.
9. the cell processing method of an asynchronous transfer mode switching system, described asynchronous transfer mode switching system comprise be used to transmit ATM cell, have a cell switching assembly of a switching port and have user's plate of a plurality of user ports at least, it is characterized in that described cell processing method comprises the steps:
Be included in the inspection position of the title in the cell by inspection, to determine that the cell that comes from described switching port is point-to-point communication cell or point-to-multipoint communication cell;
If described cell is the point-to-point communication cell, then described cell demultiplex, so that the cell behind the demultiplex is sent to a predetermined port in the described user port, comprise according to control information, translation is included in title in the cell, and the cell with the title after the translation is transferred at least one port in the described user port;
If cell is the point-to-multipoint communication cell, duplicate cell, cell after duplicating with transmission at least one mouthful in the described user port comprises according to the title after the translation and selects user port, and the cell that has separated title is sent to the selected user port.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019960069640A KR100467708B1 (en) | 1996-12-21 | 1996-12-21 | Cell processing apparatus and method of asynchronous transfer mode switching system |
| KR69640/96 | 1996-12-21 | ||
| KR69640/1996 | 1996-12-21 |
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| Publication Number | Publication Date |
|---|---|
| CN1186391A CN1186391A (en) | 1998-07-01 |
| CN1104126C true CN1104126C (en) | 2003-03-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN97122288A Expired - Fee Related CN1104126C (en) | 1996-12-21 | 1997-11-10 | Apparatus and method for processing ATM cells in ATM switching system |
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| Country | Link |
|---|---|
| US (1) | US6301255B1 (en) |
| JP (1) | JP2971426B2 (en) |
| KR (1) | KR100467708B1 (en) |
| CN (1) | CN1104126C (en) |
| RU (1) | RU2134024C1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6477150B1 (en) * | 2000-03-03 | 2002-11-05 | Qualcomm, Inc. | System and method for providing group communication services in an existing communication system |
| EP1287651B1 (en) * | 2000-06-08 | 2012-02-22 | Thomson Licensing | Atm multicasting for delivering information over a network |
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- 1996-12-21 KR KR1019960069640A patent/KR100467708B1/en not_active IP Right Cessation
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- 1997-11-10 CN CN97122288A patent/CN1104126C/en not_active Expired - Fee Related
- 1997-12-22 JP JP35250097A patent/JP2971426B2/en not_active Expired - Fee Related
- 1997-12-22 US US08/995,995 patent/US6301255B1/en not_active Expired - Fee Related
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| JPH08331536A (en) * | 1995-05-30 | 1996-12-13 | Mitsubishi Electric Corp | Digital video signal distributer |
Also Published As
| Publication number | Publication date |
|---|---|
| KR19980050795A (en) | 1998-09-15 |
| JPH10190702A (en) | 1998-07-21 |
| KR100467708B1 (en) | 2005-05-11 |
| US6301255B1 (en) | 2001-10-09 |
| RU2134024C1 (en) | 1999-07-27 |
| JP2971426B2 (en) | 1999-11-08 |
| CN1186391A (en) | 1998-07-01 |
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